2007 9-3 2.0, the drivers side cooling fan only works if I start the engine and `disconnect the temp sensor. The ac compressor and passenger side fan never engage. I have replaced cooling fan relay and all fuses. Any suggestions?
Generic answer, not SAAB specific.
I don't know which fan is for cooling or which for Air Con.
Cooling fan only comes on when the temperature gets pretty high. You will (probably) find that the temp sensor goes open circuit (internally) to turn the fan on, which is the same as you disconnecting it. So probably irrelevant.
A/C (usually) the fan only works when the A/C is turned on (to cool the A/C evaporator), altho it might be temperature dependant as well.
If you delve thru WIS it should tell you.